Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 288)

Section 5A
9/440 Resolver--based CNC/Drive System
5A-42
System Grounding
Figure 5A.21 illustrates the recommended 9/440 Resolver--based
grounding scheme. All grounds terminate on a single point. Note there are
two separate ground wires going to the system module. One ground
connects to PE of the system module power terminal block, the other
connects to the ground stud found just beneath the wiring board on the
mounting bracket for the 9/440 Resolver--based CNC assembly.
9/440 Resolver--based
System Module
Open
cover
9/440
Resolver--based CNC
Assembly
PE Stud
Power Terminal Block
DC+
INT
COL
W1
W2
U
W
V PE
PE Power Terminal Block Ground